| /* $OpenBSD: ssh-add.c,v 1.81 2006/07/06 16:03:53 stevesk Exp $ */ |
| /* |
| * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| * All rights reserved |
| * Adds an identity to the authentication server, or removes an identity. |
| * |
| * As far as I am concerned, the code I have written for this software |
| * can be used freely for any purpose. Any derived versions of this |
| * software must be clearly marked as such, and if the derived work is |
| * incompatible with the protocol description in the RFC file, it must be |
| * called by a name other than "ssh" or "Secure Shell". |
| * |
| * SSH2 implementation, |
| * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "includes.h" |
| |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| |
| #include <openssl/evp.h> |
| |
| #include <pwd.h> |
| |
| #include "ssh.h" |
| #include "rsa.h" |
| #include "log.h" |
| #include "xmalloc.h" |
| #include "key.h" |
| #include "authfd.h" |
| #include "authfile.h" |
| #include "pathnames.h" |
| #include "misc.h" |
| |
| /* argv0 */ |
| extern char *__progname; |
| |
| /* Default files to add */ |
| static char *default_files[] = { |
| _PATH_SSH_CLIENT_ID_RSA, |
| _PATH_SSH_CLIENT_ID_DSA, |
| _PATH_SSH_CLIENT_IDENTITY, |
| NULL |
| }; |
| |
| /* Default lifetime (0 == forever) */ |
| static int lifetime = 0; |
| |
| /* User has to confirm key use */ |
| static int confirm = 0; |
| |
| /* we keep a cache of one passphrases */ |
| static char *pass = NULL; |
| static void |
| clear_pass(void) |
| { |
| if (pass) { |
| memset(pass, 0, strlen(pass)); |
| xfree(pass); |
| pass = NULL; |
| } |
| } |
| |
| static int |
| delete_file(AuthenticationConnection *ac, const char *filename) |
| { |
| Key *public; |
| char *comment = NULL; |
| int ret = -1; |
| |
| public = key_load_public(filename, &comment); |
| if (public == NULL) { |
| printf("Bad key file %s\n", filename); |
| return -1; |
| } |
| if (ssh_remove_identity(ac, public)) { |
| fprintf(stderr, "Identity removed: %s (%s)\n", filename, comment); |
| ret = 0; |
| } else |
| fprintf(stderr, "Could not remove identity: %s\n", filename); |
| |
| key_free(public); |
| xfree(comment); |
| |
| return ret; |
| } |
| |
| /* Send a request to remove all identities. */ |
| static int |
| delete_all(AuthenticationConnection *ac) |
| { |
| int ret = -1; |
| |
| if (ssh_remove_all_identities(ac, 1)) |
| ret = 0; |
| /* ignore error-code for ssh2 */ |
| ssh_remove_all_identities(ac, 2); |
| |
| if (ret == 0) |
| fprintf(stderr, "All identities removed.\n"); |
| else |
| fprintf(stderr, "Failed to remove all identities.\n"); |
| |
| return ret; |
| } |
| |
| static int |
| add_file(AuthenticationConnection *ac, const char *filename) |
| { |
| Key *private; |
| char *comment = NULL; |
| char msg[1024]; |
| int fd, perms_ok, ret = -1; |
| |
| if ((fd = open(filename, 0)) < 0) { |
| perror(filename); |
| return -1; |
| } |
| |
| /* |
| * Since we'll try to load a keyfile multiple times, permission errors |
| * will occur multiple times, so check perms first and bail if wrong. |
| */ |
| perms_ok = key_perm_ok(fd, filename); |
| close(fd); |
| if (!perms_ok) |
| return -1; |
| |
| /* At first, try empty passphrase */ |
| private = key_load_private(filename, "", &comment); |
| if (comment == NULL) |
| comment = xstrdup(filename); |
| /* try last */ |
| if (private == NULL && pass != NULL) |
| private = key_load_private(filename, pass, NULL); |
| if (private == NULL) { |
| /* clear passphrase since it did not work */ |
| clear_pass(); |
| snprintf(msg, sizeof msg, "Enter passphrase for %.200s: ", |
| comment); |
| for (;;) { |
| pass = read_passphrase(msg, RP_ALLOW_STDIN); |
| if (strcmp(pass, "") == 0) { |
| clear_pass(); |
| xfree(comment); |
| return -1; |
| } |
| private = key_load_private(filename, pass, &comment); |
| if (private != NULL) |
| break; |
| clear_pass(); |
| snprintf(msg, sizeof msg, |
| "Bad passphrase, try again for %.200s: ", comment); |
| } |
| } |
| |
| if (ssh_add_identity_constrained(ac, private, comment, lifetime, |
| confirm)) { |
| fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); |
| ret = 0; |
| if (lifetime != 0) |
| fprintf(stderr, |
| "Lifetime set to %d seconds\n", lifetime); |
| if (confirm != 0) |
| fprintf(stderr, |
| "The user has to confirm each use of the key\n"); |
| } else if (ssh_add_identity(ac, private, comment)) { |
| fprintf(stderr, "Identity added: %s (%s)\n", filename, comment); |
| ret = 0; |
| } else { |
| fprintf(stderr, "Could not add identity: %s\n", filename); |
| } |
| |
| xfree(comment); |
| key_free(private); |
| |
| return ret; |
| } |
| |
| static int |
| update_card(AuthenticationConnection *ac, int add, const char *id) |
| { |
| char *pin; |
| int ret = -1; |
| |
| pin = read_passphrase("Enter passphrase for smartcard: ", RP_ALLOW_STDIN); |
| if (pin == NULL) |
| return -1; |
| |
| if (ssh_update_card(ac, add, id, pin, lifetime, confirm)) { |
| fprintf(stderr, "Card %s: %s\n", |
| add ? "added" : "removed", id); |
| ret = 0; |
| } else { |
| fprintf(stderr, "Could not %s card: %s\n", |
| add ? "add" : "remove", id); |
| ret = -1; |
| } |
| xfree(pin); |
| return ret; |
| } |
| |
| static int |
| list_identities(AuthenticationConnection *ac, int do_fp) |
| { |
| Key *key; |
| char *comment, *fp; |
| int had_identities = 0; |
| int version; |
| |
| for (version = 1; version <= 2; version++) { |
| for (key = ssh_get_first_identity(ac, &comment, version); |
| key != NULL; |
| key = ssh_get_next_identity(ac, &comment, version)) { |
| had_identities = 1; |
| if (do_fp) { |
| fp = key_fingerprint(key, SSH_FP_MD5, |
| SSH_FP_HEX); |
| printf("%d %s %s (%s)\n", |
| key_size(key), fp, comment, key_type(key)); |
| xfree(fp); |
| } else { |
| if (!key_write(key, stdout)) |
| fprintf(stderr, "key_write failed"); |
| fprintf(stdout, " %s\n", comment); |
| } |
| key_free(key); |
| xfree(comment); |
| } |
| } |
| if (!had_identities) { |
| printf("The agent has no identities.\n"); |
| return -1; |
| } |
| return 0; |
| } |
| |
| static int |
| lock_agent(AuthenticationConnection *ac, int lock) |
| { |
| char prompt[100], *p1, *p2; |
| int passok = 1, ret = -1; |
| |
| strlcpy(prompt, "Enter lock password: ", sizeof(prompt)); |
| p1 = read_passphrase(prompt, RP_ALLOW_STDIN); |
| if (lock) { |
| strlcpy(prompt, "Again: ", sizeof prompt); |
| p2 = read_passphrase(prompt, RP_ALLOW_STDIN); |
| if (strcmp(p1, p2) != 0) { |
| fprintf(stderr, "Passwords do not match.\n"); |
| passok = 0; |
| } |
| memset(p2, 0, strlen(p2)); |
| xfree(p2); |
| } |
| if (passok && ssh_lock_agent(ac, lock, p1)) { |
| fprintf(stderr, "Agent %slocked.\n", lock ? "" : "un"); |
| ret = 0; |
| } else |
| fprintf(stderr, "Failed to %slock agent.\n", lock ? "" : "un"); |
| memset(p1, 0, strlen(p1)); |
| xfree(p1); |
| return (ret); |
| } |
| |
| static int |
| do_file(AuthenticationConnection *ac, int deleting, char *file) |
| { |
| if (deleting) { |
| if (delete_file(ac, file) == -1) |
| return -1; |
| } else { |
| if (add_file(ac, file) == -1) |
| return -1; |
| } |
| return 0; |
| } |
| |
| static void |
| usage(void) |
| { |
| fprintf(stderr, "Usage: %s [options] [file ...]\n", __progname); |
| fprintf(stderr, "Options:\n"); |
| fprintf(stderr, " -l List fingerprints of all identities.\n"); |
| fprintf(stderr, " -L List public key parameters of all identities.\n"); |
| fprintf(stderr, " -d Delete identity.\n"); |
| fprintf(stderr, " -D Delete all identities.\n"); |
| fprintf(stderr, " -x Lock agent.\n"); |
| fprintf(stderr, " -X Unlock agent.\n"); |
| fprintf(stderr, " -t life Set lifetime (in seconds) when adding identities.\n"); |
| fprintf(stderr, " -c Require confirmation to sign using identities\n"); |
| #ifdef SMARTCARD |
| fprintf(stderr, " -s reader Add key in smartcard reader.\n"); |
| fprintf(stderr, " -e reader Remove key in smartcard reader.\n"); |
| #endif |
| } |
| |
| int |
| main(int argc, char **argv) |
| { |
| extern char *optarg; |
| extern int optind; |
| AuthenticationConnection *ac = NULL; |
| char *sc_reader_id = NULL; |
| int i, ch, deleting = 0, ret = 0; |
| |
| /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
| sanitise_stdfd(); |
| |
| __progname = ssh_get_progname(argv[0]); |
| init_rng(); |
| seed_rng(); |
| |
| SSLeay_add_all_algorithms(); |
| |
| /* At first, get a connection to the authentication agent. */ |
| ac = ssh_get_authentication_connection(); |
| if (ac == NULL) { |
| fprintf(stderr, |
| "Could not open a connection to your authentication agent.\n"); |
| exit(2); |
| } |
| while ((ch = getopt(argc, argv, "lLcdDxXe:s:t:")) != -1) { |
| switch (ch) { |
| case 'l': |
| case 'L': |
| if (list_identities(ac, ch == 'l' ? 1 : 0) == -1) |
| ret = 1; |
| goto done; |
| case 'x': |
| case 'X': |
| if (lock_agent(ac, ch == 'x' ? 1 : 0) == -1) |
| ret = 1; |
| goto done; |
| case 'c': |
| confirm = 1; |
| break; |
| case 'd': |
| deleting = 1; |
| break; |
| case 'D': |
| if (delete_all(ac) == -1) |
| ret = 1; |
| goto done; |
| case 's': |
| sc_reader_id = optarg; |
| break; |
| case 'e': |
| deleting = 1; |
| sc_reader_id = optarg; |
| break; |
| case 't': |
| if ((lifetime = convtime(optarg)) == -1) { |
| fprintf(stderr, "Invalid lifetime\n"); |
| ret = 1; |
| goto done; |
| } |
| break; |
| default: |
| usage(); |
| ret = 1; |
| goto done; |
| } |
| } |
| argc -= optind; |
| argv += optind; |
| if (sc_reader_id != NULL) { |
| if (update_card(ac, !deleting, sc_reader_id) == -1) |
| ret = 1; |
| goto done; |
| } |
| if (argc == 0) { |
| char buf[MAXPATHLEN]; |
| struct passwd *pw; |
| struct stat st; |
| int count = 0; |
| |
| if ((pw = getpwuid(getuid())) == NULL) { |
| fprintf(stderr, "No user found with uid %u\n", |
| (u_int)getuid()); |
| ret = 1; |
| goto done; |
| } |
| |
| for (i = 0; default_files[i]; i++) { |
| snprintf(buf, sizeof(buf), "%s/%s", pw->pw_dir, |
| default_files[i]); |
| if (stat(buf, &st) < 0) |
| continue; |
| if (do_file(ac, deleting, buf) == -1) |
| ret = 1; |
| else |
| count++; |
| } |
| if (count == 0) |
| ret = 1; |
| } else { |
| for (i = 0; i < argc; i++) { |
| if (do_file(ac, deleting, argv[i]) == -1) |
| ret = 1; |
| } |
| } |
| clear_pass(); |
| |
| done: |
| ssh_close_authentication_connection(ac); |
| return ret; |
| } |